Practical Failure Analysis

, Volume 3, Issue 6, pp 41–46 | Cite as

Failure of a premix feeder line on a land-based gas turbine

  • A. Neidel
  • C. Yao
Peer Reviewed Articles

Abstract

A premix feeder line on a land-based gas turbine was found to be leaking, and the source of the leakage was traced back to a crack in a pipe-to-fitting weld. The weld joined a coupling made from the X6CrNiMoTi17-12-2 austenitic stainless steel to a type 316L austenitic stainless steel reducer. A root-cause assessment was conducted to determine the cause of the crack. Evidence of fatigue and corrosive attack was found. Various factors that influence the susceptibility to corrosion and cracking, such as heat tints, geometry of the weld, and surface finish of the component, are discussed. Recommendations are made for corrective actions and failure prevention.

Keywords

austenitic stainless steel corrosion fatigue gas turbine heat tint welding 

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References

  1. 1.
    R. Saggau, H. Pries, and M. Finke: “Heat Tints due to Welding and Their Influence on the Corrosion of High-Alloy CrNi Steels,”Z. Metallkd., 2001,92(3), pp. 286–92 (in German).Google Scholar
  2. 2.
    D. Talbot and J. Talbot:Corrosion Science and Technology, CRC Press LLC, Boca Raton, FL, 1998, p. 182.Google Scholar
  3. 3.
    A.J. Sedriks:Corrosion of Stainless Steels, 2nd ed., John Wiley & Sons, Inc., New York, NY, 1996, pp. 243–45.Google Scholar

Copyright information

© ASM International - The Materials Information Society 2003

Authors and Affiliations

  • A. Neidel
    • 1
  • C. Yao
    • 1
  1. 1.Siemens AG, Power Generation, G317QMWBerlinGermany

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